crow bar steel construction help to shift industrial machines

prejudice to excuse me if I would like to take this opportunity to build a crowbar big but sturdy and long steel with forged nail it says that they are products of rolling steel crow bar to spostaare industrial machines could you give me some suggestions thanks steel lever dolly homemade

It's a little hard to tell by the pictures but I would use something in the area of 45 deg. angle for the handle.
Also larger as opposed to smaller bearing/wheels might be in order. In the case of checker plate flooring you may not always have a smooth surface to roll on. Also a way of "tapping" the leading edge of the device under the load might be a good idea.
A good crow bar modified might be a starting place. I've spent 35 years as a mill wright positioning heavy equipment so I have a pretty good idea about what you're looking for.